How to use fill3 to make a box

X= [1 26 26 1]
Y= [0.5 .5 25.5 25.5]
Z= [0 0 0 0]   
fill3 (X, Y, Z, 'blue')  

X1= [1 26 26 1]
Y1= [0.5 .5 25.5 25.5]
Z1= [25 25 25 25]   
fill3 (X1, Y1, Z1, 'red')  

I wanna make a box with fill3 but when i typed in the 2nd fill3 code (the red one), it does not produce a surface. How can i make multiple surfaces with fill3