Located on Windsor High Street next to the Guild Hall is a green hexagonal Penfold post box.

This broke the standard pattern and so in 1866 the Post Office again produced a standard letter box. This time the box was designed by J W Penfold and came in three sizes. Problems were encountered with some of the early designs however and modifications were made, such as the inclusion of downward-pointing shoots to help prevent letters being caught up in the cap of the box. The ‘Penfold’ letter box while not particularly a success operationally was very popular with many people.

As a standard box however it was not to survive. In 1879 a further standard box was produced. This time more of the earlier lessons were taken on board. The new standard box at last resembled the letter box that is today the iconic image of Britain – cylindrical with round cap and horizontal aperture under a protruding cap with front opening door and black painted base.

The Postal Museum Website explains how the Pillar Boxes went from red to green and back again.

Green occupies more space in the spectrum visible to the human eye than most colors, and is second only to blue as a favorite color. Green is the pervasive color in the natural world, making it an ideal backdrop in interior design because we are so used to seeing it everywhere.

The natural greens, from forest to lime, are seen as tranquil and refreshing, with a natural balance of cool and warm (blue and yellow) undertones. Green is considered the color of peace and ecology.

How the color green affects us physically

• Soothes

• Relaxes mentally, as well as physically

• Helps alleviate depression, nervousness, and anxiety

• Offers a sense of renewal, self-control, and harmony

Lots more information on the colour green can be found on the Sensational Colour website.