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opticolillu/ion/

Both c en te r r ec tang l es a r e t he s ame 

s hade o f g r een .

R e v e r s i b l e c u b e s . T h e b l a c k  

areas may appear to be the 

t ops o f t he c ubes o r t hey may  

appear t o be t he bo t t oms .

 A ll fo u r le av es ar e th e sa m e s had e o f g r ee n .

T he g r een l i nes appear c u r v ed , 

bu t a r e ac tua l l y s t r a i gh t and  

par a l l e l .

> <

The red l ine and the b lue l ine  

ar e t he s ame l eng th .

T he r e appear t o be

on one end and th

o the r .

T h e g re en l i n

s t r a i gh t and

T h e t w o l i n

l eng th i n t he

n o t i n t h e g

T h e g r e e n l in e s f o r m t r u e  

s quar es .

c o r r ec t bu t i s no t .

SIGN #450 a t r ue c i r c l e .

The b lack l ines ar

length in both the

g r een f i gu r es .

♦ *

*

T he d i s tanc e

t he s ta r and t

es t d i amond

o f t he d i amon

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t h b l ue s qua r es a r e t he s ame  

e.

uT he g r een l i ne i n bo th d r aw i ngs  

i s the s ame l eng th .

i s f i gu r e may appear ¡ n a t  

as t 8 d i f f e r en t w ay s .

The green l ine and the red  

l i ne a r e t he s ame l eng th .

I t may appear t ha t y ou a r e  

e i t he r l ook i ng dow n on t hes e 

s ta i r s o r up a t t hem.

This i s not a sp i ra l , but a se

r i es o f c omp l e te c i r c l es .

 A \ >B

Lines A and X are cont inuous.

oBoth f i gu r es a r e i den t i c a l .

l o n g e r t h a n t h e h e i g h t o f t h e  

glass .

The cen ter circles in the greei  

group and in the red group are  

the same s ize.

c ube may appear t o be i n f r on t  

or back .

 A ll 4 g re en li n es ar e p a r al le l to  

one ano the r .

— -----------------------------------------------

 _____________________ 

T he c en te r b l ac k l i ne i s ha l f as  

l ong as t he t op and bo t t om  

b l ac k l i nes .

 A ll th re e li n es hav e th e s am e 

r ad i us o f c u r v a tu r e .

e r ed l i nes a r e no t c u r v ed , 

ey a r e s t r a i gh t and pa r a l l e l .