give on spatial difference between the architecture of the central court of the East Building of the National Gallery of Art by I. M. Pei (text fig. 7-5) and the interior of the National gallery's Rotunda by John Russell Pope

1# d

2# b

3# e

4# c

5# a

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.